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1- Assistant professor, Technical and Engineering Faculty, Science and Research Branch, Islamic Azad University, Tehran, Iran; samaei@srbiau.ac.ir
2- Assistant professor, Department of Marine industries, Science and Research Branch, Islamic Azad University, Tehran, Iran; m.asadian@srbiau.ac.ir
2- Assistant professor, Department of Marine industries, Science and Research Branch, Islamic Azad University, Tehran, Iran; m.asadian@srbiau.ac.ir
Abstract: (65 Views)
High-speed monohull vessels with chine hulls are widely used due to their simple design, but maintaining optimal performance at high speeds requires precise hull force analysis. This study utilizes 3D scanning to capture hull geometry, refining it in AutoCAD for efficiency. Hydrostatic and hydrodynamic assessments are conducted using Maxsurf, applying the Switkowski method.
The study examines vessel motion, crew comfort, and water ingress under different sea conditions. Results indicate that at a 5.4-degree trim, pitch motion intensifies in harmonic waves, yaw motion increases in beam waves, and pitch and heave motions are more pronounced in head waves. Water ingress becomes a concern at this trim in Beaufort 2 and 3, with MSI peaking at 12.5% in Beaufort 3. The lowest resistance occurs at 5.22 knots, but higher trims raise power demands. Manual trim adjustments using outboard engines and jacks effectively mitigate these effects.
The study examines vessel motion, crew comfort, and water ingress under different sea conditions. Results indicate that at a 5.4-degree trim, pitch motion intensifies in harmonic waves, yaw motion increases in beam waves, and pitch and heave motions are more pronounced in head waves. Water ingress becomes a concern at this trim in Beaufort 2 and 3, with MSI peaking at 12.5% in Beaufort 3. The lowest resistance occurs at 5.22 knots, but higher trims raise power demands. Manual trim adjustments using outboard engines and jacks effectively mitigate these effects.
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Highlights
- A combined computational and experimental approach was used to optimize the hydrodynamic performance and stability of high-speed monohull vessels with chine hulls.
- 3D scanning, AutoCAD modeling, and Maxsurf simulation techniques were employed to precisely reconstruct hull geometry and evaluate performance under varying sea conditions.
- At a 5.4° trim angle, pitch motion increased by 33–48% in harmonic waves, while yaw and roll motions rose up to 75× and 83× respectively in beam seas, indicating significant stability concerns.
- Water ingress occurred at Beaufort levels 2 and 3 only at 5.4° trim, with Motion Sickness Incidence (MSI) reaching a peak of 12.5% under Beaufort 3, impacting crew comfort.
- Minimum resistance was observed at 5.22 knots, while trim angles above 5.4° enabled speeds beyond 60 knots but required significantly more power due to increased resistance.
- Manual trim adjustment mechanisms (e.g., jack-equipped outboard engines) effectively mitigated hydrodynamic inefficiencies, offering a practical solution for real-time stability control.
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